void cipher_context_release(cipher_ctx_t *ctx)
{
if (enc_method >= SALSA20) {
return;
}
#ifdef USE_CRYPTO_APPLECC
cipher_cc_t *cc = &ctx->cc;
if (cc->cryptor != NULL) {
CCCryptorRelease(cc->cryptor);
cc->cryptor = NULL;
}
if (cc->valid == kCCContextValid) {
return;
}
#endif
cipher_evp_t *evp = &ctx->evp;
#if defined(USE_CRYPTO_OPENSSL)
EVP_CIPHER_CTX_cleanup(evp);
#elif defined(USE_CRYPTO_POLARSSL)
// NOTE: cipher_free_ctx deprecated in PolarSSL 1.3.11
cipher_free_ctx(evp);
#elif defined(USE_CRYPTO_MBEDTLS)
// NOTE: cipher_free_ctx deprecated
mbedtls_cipher_free(evp);
#endif
}
void cipher_context_release(cipher_ctx_t *evp) {
#if defined(USE_CRYPTO_OPENSSL)
EVP_CIPHER_CTX_cleanup(evp);
#elif defined(USE_CRYPTO_POLARSSL)
cipher_free_ctx(evp);
#endif
}
void cipher_context_set_iv(cipher_ctx_t *evp, uint8_t *iv, size_t iv_len, int enc)
{
if (evp == NULL || iv == NULL) {
LOGE("cipher_context_set_keyiv(): Cipher context or IV is null");
return;
}
if (enc) {
rand_bytes(iv, iv_len);
}
#if defined(USE_CRYPTO_OPENSSL)
if (!EVP_CipherInit_ex(evp, NULL, NULL, enc_key, iv, enc)) {
EVP_CIPHER_CTX_cleanup(evp);
FATAL("Cannot set key and IV");
}
#elif defined(USE_CRYPTO_POLARSSL)
if (cipher_setkey(evp, enc_key, enc_key_len * 8, enc) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher key");
}
#if POLARSSL_VERSION_NUMBER >= 0x01030000
if (cipher_set_iv(evp, iv, iv_len) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher IV");
}
if(cipher_reset(evp) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot finalize PolarSSL cipher context");
}
#else
if(cipher_reset(evp, iv) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher IV");
}
#endif
#endif
#ifdef DEBUG
dump("IV", iv);
#endif
}
void cipher_context_release(cipher_ctx_t *ctx)
{
#ifdef USE_CRYPTO_APPLECC
cipher_cc_t *cc = &ctx->cc;
if (cc->cryptor != NULL)
{
CCCryptorRelease(cc->cryptor);
cc->cryptor = NULL;
}
if (cc->valid == kCCContextValid)
{
return;
}
#endif
cipher_evp_t *evp = &ctx->evp;
#if defined(USE_CRYPTO_OPENSSL)
EVP_CIPHER_CTX_cleanup(evp);
#elif defined(USE_CRYPTO_POLARSSL)
cipher_free_ctx(evp);
#endif
}
void cipher_context_set_iv(cipher_ctx_t *ctx, uint8_t *iv, size_t iv_len,
int enc)
{
const unsigned char *true_key;
if (iv == NULL) {
LOGE("cipher_context_set_iv(): IV is null");
return;
}
if (!enc) {
memcpy(ctx->iv, iv, iv_len);
}
if (enc_method >= SALSA20) {
return;
}
if (enc_method == RC4_MD5) {
unsigned char key_iv[32];
memcpy(key_iv, enc_key, 16);
memcpy(key_iv + 16, iv, 16);
true_key = enc_md5(key_iv, 32, NULL);
iv_len = 0;
} else {
true_key = enc_key;
}
#ifdef USE_CRYPTO_APPLECC
cipher_cc_t *cc = &ctx->cc;
if (cc->valid == kCCContextValid) {
memcpy(cc->iv, iv, iv_len);
memcpy(cc->key, true_key, enc_key_len);
cc->iv_len = iv_len;
cc->key_len = enc_key_len;
cc->encrypt = enc ? kCCEncrypt : kCCDecrypt;
if (cc->cryptor != NULL) {
CCCryptorRelease(cc->cryptor);
cc->cryptor = NULL;
}
CCCryptorStatus ret;
ret = CCCryptorCreateWithMode(
cc->encrypt,
cc->mode,
cc->cipher,
cc->padding,
cc->iv, cc->key, cc->key_len,
NULL, 0, 0, 0,
&cc->cryptor);
if (ret != kCCSuccess) {
if (cc->cryptor != NULL) {
CCCryptorRelease(cc->cryptor);
cc->cryptor = NULL;
}
FATAL("Cannot set CommonCrypto key and IV");
}
return;
}
#endif
cipher_evp_t *evp = &ctx->evp;
if (evp == NULL) {
LOGE("cipher_context_set_iv(): Cipher context is null");
return;
}
#if defined(USE_CRYPTO_OPENSSL)
if (!EVP_CipherInit_ex(evp, NULL, NULL, true_key, iv, enc)) {
EVP_CIPHER_CTX_cleanup(evp);
FATAL("Cannot set key and IV");
}
#elif defined(USE_CRYPTO_POLARSSL)
// XXX: PolarSSL 1.3.11: cipher_free_ctx deprecated, Use cipher_free() instead.
if (cipher_setkey(evp, true_key, enc_key_len * 8, enc) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher key");
}
#if POLARSSL_VERSION_NUMBER >= 0x01030000
if (cipher_set_iv(evp, iv, iv_len) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher IV");
}
if (cipher_reset(evp) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot finalize PolarSSL cipher context");
}
#else
if (cipher_reset(evp, iv) != 0) {
cipher_free_ctx(evp);
FATAL("Cannot set PolarSSL cipher IV");
}
#endif
#elif defined(USE_CRYPTO_MBEDTLS)
if (mbedtls_cipher_setkey(evp, true_key, enc_key_len * 8, enc) != 0) {
mbedtls_cipher_free(evp);
FATAL("Cannot set mbed TLS cipher key");
}
if (mbedtls_cipher_set_iv(evp, iv, iv_len) != 0) {
mbedtls_cipher_free(evp);
FATAL("Cannot set mbed TLS cipher IV");
}
if (mbedtls_cipher_reset(evp) != 0) {
mbedtls_cipher_free(evp);
FATAL("Cannot finalize mbed TLS cipher context");
}
#endif
#ifdef DEBUG
dump("IV", (char *)iv, iv_len);
#endif
}
void cipher_ctx_cleanup (cipher_context_t *ctx)
{
cipher_free_ctx(ctx);
}